We humans remember things on a uniquely grand scale. From the pyramids to the Washington Monument, we build memorials so we won't forget our past. Today, I try to understand why with Michael Arad, the visionary architect behind the 9/11 Memorial at Ground Zero, in New York City. When an act of terrorism changed the world forever, how could we do justice to physical and emotional destruction that occurred? Michael answered that question the only way he knew: by creating a memory space. Join me for this powerful conversation about history, truth, healing and how the spaces we live in and pass through can change our story, both personal and global.